1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright(C) 2015 Linaro Limited. All rights reserved.
4  * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
5  */
6 
7 #ifndef _CORESIGHT_ETM_PERF_H
8 #define _CORESIGHT_ETM_PERF_H
9 
10 #include <linux/percpu-defs.h>
11 #include "coresight-priv.h"
12 
13 struct coresight_device;
14 struct cscfg_config_desc;
15 
16 /*
17  * In both ETMv3 and v4 the maximum number of address comparator implentable
18  * is 8.  The actual number is implementation specific and will be checked
19  * when filters are applied.
20  */
21 #define ETM_ADDR_CMP_MAX	8
22 
23 /**
24  * struct etm_filter - single instruction range or start/stop configuration.
25  * @start_addr:	The address to start tracing on.
26  * @stop_addr:	The address to stop tracing on.
27  * @type:	Is this a range or start/stop filter.
28  */
29 struct etm_filter {
30 	unsigned long start_addr;
31 	unsigned long stop_addr;
32 	enum etm_addr_type type;
33 };
34 
35 /**
36  * struct etm_filters - set of filters for a session
37  * @etm_filter:	All the filters for this session.
38  * @nr_filters:	Number of filters
39  * @ssstatus:	Status of the start/stop logic.
40  */
41 struct etm_filters {
42 	struct etm_filter	etm_filter[ETM_ADDR_CMP_MAX];
43 	unsigned int		nr_filters;
44 	bool			ssstatus;
45 };
46 
47 /**
48  * struct etm_event_data - Coresight specifics associated to an event
49  * @work:		Handle to free allocated memory outside IRQ context.
50  * @mask:		Hold the CPU(s) this event was set for.
51  * @snk_config:		The sink configuration.
52  * @cfg_hash:		The hash id of any coresight config selected.
53  * @path:		An array of path, each slot for one CPU.
54  */
55 struct etm_event_data {
56 	struct work_struct work;
57 	cpumask_t mask;
58 	void *snk_config;
59 	u32 cfg_hash;
60 	struct list_head * __percpu *path;
61 };
62 
63 #if IS_ENABLED(CONFIG_CORESIGHT)
64 int etm_perf_symlink(struct coresight_device *csdev, bool link);
65 int etm_perf_add_symlink_sink(struct coresight_device *csdev);
66 void etm_perf_del_symlink_sink(struct coresight_device *csdev);
67 static inline void *etm_perf_sink_config(struct perf_output_handle *handle)
68 {
69 	struct etm_event_data *data = perf_get_aux(handle);
70 
71 	if (data)
72 		return data->snk_config;
73 	return NULL;
74 }
75 int etm_perf_add_symlink_cscfg(struct device *dev,
76 			       struct cscfg_config_desc *config_desc);
77 void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *config_desc);
78 #else
79 static inline int etm_perf_symlink(struct coresight_device *csdev, bool link)
80 { return -EINVAL; }
81 int etm_perf_add_symlink_sink(struct coresight_device *csdev)
82 { return -EINVAL; }
83 void etm_perf_del_symlink_sink(struct coresight_device *csdev) {}
84 static inline void *etm_perf_sink_config(struct perf_output_handle *handle)
85 {
86 	return NULL;
87 }
88 int etm_perf_add_symlink_cscfg(struct device *dev,
89 			       struct cscfg_config_desc *config_desc)
90 { return -EINVAL; }
91 void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *config_desc) {}
92 
93 #endif /* CONFIG_CORESIGHT */
94 
95 int __init etm_perf_init(void);
96 void etm_perf_exit(void);
97 
98 #endif
99